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L. ONDERDO'NKl SEWlNG MACHINE.

APFLlCATIpN FILED Aue.21. 1915.

1 25,037. Patented Dec; 16, 1919.

4 '4 SHEETS-SHEET I.

L. ONDERDONK.

SEWING MACHINE.

APPLICATION FILED AUG.2I. 1915.

Patented De0. 16,1919.

4 SHEETSSHEET 2.

, 7L. O NDERD ONK. SEWING MACHINE.

I APPLICATION FILED AUG.2I. I915- 1.325037. Patented Dec.16,1919.

4 SHEETS-SHEET 3.

L. 'ONDERD-ONK.

SEWING MACHINE.

I 1 110111014 FILED 11116.21. 1.915. I 1,325,037. Patented Dec. 16,1919.

4 SHEETS-LSHEET 4.

UNITED STATES PATENT OFFICE.

LANSING ONDEBDONK, OF NEW YORK; N. Y., ASSIGNOR TO UNION SIPECIAL MACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SEWING-MACHINE.

Specification of Letters Patent. Patented Dec. 16, 1919.

' Application filed August 21, 1915. Serial No. 46,607.

To all whom it may concern:

Be it known that I,- LANSING a citizen of the United States, residirfiizg at New York, in the county of New' or k, State of New York, have invented certain new and useful Improvements in Sewing-v Machines, of which the following is a description, reference being had to the accompanying drawin and to the figures of refnism for manipulating the material.

tion

An object of the invention is to provide a feeding mechanism wherein an upper feed dogl cooperates with the presser foot in feeding the material, and wherein the mechanism for operating thefeed dog and.

presser foot are so timed and constructed that thefeed dog and} presser foot are in engagement with the material for a timeinterval between the lifting movements 0 the feed dog and presser foot. y

A further object of the invention is to provide a device of the above character wherein the lifting mechanism for the feed dog includes devices having a lost motion so that a certain portion of the movements of the lifting devices become. ineifective to lift the feed :dog. 1 p

These and other-objects will in part be obvious and willin part be hereinafter more fully described. i" F j In the drawings,'which show by way of illustration one embodiment of the inven- Figure 1 is anend view of a sewing ma-' chine having my improvements applied thereto;

Fig. 2 is parts being broken away;

Fig. 3 is a transverse sectional view along one side of the feed dog, showing the upper feed dog, the lower feed dog, and a portion of the work support, the presser foot and,

plan view of the parts shown ONDERDONK,

a rear view of the same, certain- Fig. 9 is a detail showing the operating arm for lifting the presser bar;

Fig. 10 is a detail view showing the rock lever for lifting the presser foot and feed Fig. 11 is a detail showing the lower feeding mechanism.

he invention consists broadly in providing a sewing machine having a work sup port with a presser foot which engages the material on the work support and an upper feed do which cooperates with the presser foot in eeding the material. The feed dog and .presser foot are connected to a rock lever which is actuated so as to alternately raise the presser foot and feed dog so that the presser foot may be positively raised during-the feedin movements of the feed dog, and the fee dog may be positively raised for its return or idle movement. The mechanism between this rock lever and the feed dog includes devices which have a lost movement or an ineffective movement so that the feed dog and presser foot will remain on the material for a time interval beneedles 5 and 6. Any suitable complemental stitch forming mechanism may be used to cooperate with said needles beneath the work support.

Mounted on the supporting bed is a work support 7. Located beneath the work support is a feeding mechanism consisting of a This needle bar as lower feed dog 8 which is mounted on a feed bar 9, and this feed bar is in turn pivoted to a feed rocker 10. The feed rocker 10 is pivoted to the supporting bed 1 and is oscillated back and forth by suitable connections to the main shaft 11. The feed bar 9 is raised and lowered by an eccentric 12 on the main shaft. This part of the feeding mechanism is of the well-known construction and further detail description thereof is notthought necessary.

The material is held on the work support by a presser foot 13. This presser foot is carried by a-presser bar 11 mounted in the over hanging arm 3 of the machine. The presser bar may be raised by a hand lever 15 or by a lever 16 connected to a suitable treadle or knee shift. The presser bar is held down to hold the presser foot on the work support by a spring 17 which bears on a pin 18 projecting laterally from the presser bar 11.

The feeding mechanism in addition to the above parts also includes an upper feed dog 19. This feed dog is adj ustably connected to a feed bar 20 which is pivoted at 21 to :1. depending arm 22 fixed to a shaft 23. The shaft 23 is mounted in bearings 21-91% carried by the overhanging arm 3. This shaft 23 carries a second depending arm 25 which is fixed to the shaft by suitable clamping screws. The shaft 23 at its lower end carries a ball stud 26 which is engaged by an eccentric 28 on the main shaft 11. As this main shaft rotates, the arm 25 will be oscillated and this. in turn, will oscillate the shaft 23 which moves the feed bar 20 back and forth, thus giving the fecdingmovement to the feed dog 19.

The feed dog 19 is raised and lowered by a rock lever 29. This rock lever 29 is fulcrumed on an arm 30 which is rigidly fixed to the presser bar 1 1. The arm 31 of the rock lever 29 extends substantially in a horizontal direction from the fulcrum point of the rock lever, and a rod 32 is pivoted to the outer end of this arm. This rod depends from the arm in substantially a vertical position and extends through a perforated lug 33 which is fixed to the feed bar 20 by a clamping screw 31. The upper face of the feed bar 20 is recessed to receive this lug so that a single clamping screw will hold the same in fixed position relative to the feed bar. On the lower end of the rod 32 there is an adjustable nut 35, the end of the rod being threaded to receive this nut. A lock nut 36 serves to hold the adjustable nut in adjusted position. Also threaded onto the rod 32 is a nut 37. A coiled spring 38 encircles the rod 32 and bears against the nut 37 at one end and against the lug 33 at its other end.

The other arm 39 of the rock lever 29 proj ects upwardly in substantially a vertical direction.

At the upper end of this arm there is a hall stud 10. A link 11 is connected to said ball stud a0. Mounted on the shaft'23 is a rock frame 12. This rock frame has a downwardly and forwardly projecting arm 43 (see Fig. Said last-named arm is provided with a ball stud 1. and the link 41 is connected at its other end to this ball stud 44. The rock frame is formed with a laterally projecting arm 45 which is slotted, as at 16. A rod 17 coi'iperates with an cecentric 48 on the main shaft 11 and is connected to a. stud 19 which is adjustable in the slot 46. As the main shaft 11 rotates, the eccentric -18 will oscillate this rock frame 42 and through the link 11 will oscillate the rock lever 29.

The arm 30, which serves as afulcrum support for the rock lever. projects rearwardly from the presser bar 11 and is forked to engage a guide bar 50. This pre vents the presser bar from turning and holds the arm 30 so that it moves up and down without lateral oscillation.

The feed dog 19 is serrated or toothed on its lowerv face in the usual manner. Said feed dog at its rear end extends upwardly, as at 51, and engages av seat formed in a vertically depending portion 52 of the feed bar 20. A clamping screw 53 holds the feed dog on the feed bar and permits the same to be adjusted vertically. The presser foot 13 is formed with two needle openings 51 and 55 which receive respectively the pairs of needles 5 and 6. The presser foot is carried by a shank 56. This shank is'forked, and the arms 57 and 58 of the fork carry the foot portion 13. Said presser foot 13 is provided with a longitudinal slot 59 which extends from its rear end to a point adjacent the extreme end of the upturned toe of the foot. The feed'dog 19 moves back and forth in this slot 59. The toe of the presser foot extends above the feed dog 19 so that there is ample room for the feed dog to move back HHCl-fOl'tll and engage the material as it is fed underneath the lip-turned portion of the prcsser foot.

A bracket arm 60 is clamped to the lower end of the guide bar 50, and at its lower end carries a roller which projects laterally underneath the feed bar 20. T his roller serves as a rest for the feed bar 20 when there is no material in the machine.

The movements of the rock lever 29 in one direction raise the presser foot and lower the upper feed dog into engagement with the material, while the movements of this rock lever in the other direction raise the feed clog and lower the presser foot onto the material. When the rock lever 29 is moved to the left, as viewed in Figs. 5 and 6, the rod 32 will first be lowered, permitting the feed dog to engage the material. The coiled sprin 38 is of less tension than the spring 17 which holds the presser foot on the material. Therefore, after the feed dog has engaged the material, further movement of the rock lever in the same direction will cause the coils of the spring 38 to come into contact and said spring to become, in effect, a rigid member. The rod 32 moves downward through the perforated lug 38 carrying the nut 35 away from this lug to the position shown in Fig. 5. After this coiled spring 38' has collapsed and become a ri id member, then further movement of this rock lever 29 in the same direction will raise the presser bar and, consequently, the presser foot from the material.

It will thus be seen that the feed dog engages the material an interval of time before the presser foot is raised, this in} rval of time being that portion of the move ent of the rock lever which is necessary to bring the coils of the spring 38 into contact and convert said spring into a substantially rigid member. A movement of the rock lever 29 in the opposite direction willlower the presser foot into engagement with the material, after which the bar 32 will be raised, bringing the stop nut 35 into engagement with the lug A. continued movement of this rock lever to the right, as viewed in Figs. 5 and 6, will then raise the feed dog from the material, and while said feed dog is raised, the arm 22 is oscillated to return the feed dog to its forward position for the next feeding movement. It is understood, of course, that this arm 22 is oscillated in the other direction, while the feed dog is in engagement with the material and while the presser foot is raised for feeding the material. From the above, it will be apparent that the presser foot will engage the material an interval of time before the feed dog is raised, and this interval of time depends upon the movement of the rock lever necessary to bring the stop nut 35 on the rod 32 into engagement with the lug It will be apparent from the above description that I have provided an actuating mech anism for lifting the feed dog and presser foot which operates first to lower one of these members onto the material where it remains for an interval of time before the other is raised; then the last-named member I will be again lowered onto the material and remain there an interval of time before the other one is raised. In other words, there is an interval of time between each lifting movement wherein both the feed dog and presser foot remain on the material, and this is brought about through the lost motion in the connection between the rock lever and the feed dog.

It is well-known that in sewing machines of the type above described. which areparticularly adapted for operating upon heavy material, such as leather, there is more or less rebound when the presser foot or the feed dog strikes the material, which is due in part to the rapid movement of the parts and in part to the heavy pressure necessary to properly hold and properly feed these this rebound in the element striking the ma-' terial is over before the other element is lifted from the material.

It will be understood, of course, that, when the presser bar is raised, the rock lever 29 will be held from oscillation by the link 41 and, therefore, lifting of the presser bar will also bodily raise the rocklever and lift the feed bar 20 and the feed dog 19.

It is obvious that minor changes in the details of construction and the arrangement of parts ,may be made without departing from the spirit of the invention, as set forth appended claims.

Having thus described the invention, what is claimed as new is 1. A feeding mechanism for sewing machines includingin combination a work support, a lower feed dog and means for oper ating the same, a presser foot, an upper feed dog engaging the material on the work support, means for moving said upper feed dog back and forth, and devices for alternately raising and lowering said upper feed dog and presser foot, said devices including a rock lever and connecting means for causing the feed dog and presser vfoot to simultaneously remain in engagement with the material for an interval of time before either the feed dog or presser foot is lifted.

2. A feeding mechanism for sewing machines including in combination, a work support, a presser foot, an upper feed dog engaging the material on the work support, means for moving said upper feed dog back and forth, and means for alternately raising and lowering the feed dog and presser foot, said means including devices having a lost motion whereby the presser foot and feed dog will remain on the material for an interval of time prior to the lifting movements thereof.

' 3. A. feeding mechanism for sewing machines including in combination, a work support, a presser foot, an

foot including a rock lever, means for oscillating the rock lever, means for positively connecting the rock lever to the presser foot, and devices for connecting said rock lever to the feed dog,-said devices having a lost motion whereby the feed dog and the presser will remain on the material for an interval of time prior to the lifting movements thereof.

4. A feeding mechanism for sewing machines including in combination, a work upper feed dog engaging the material on the work support, means for moving said upper feed dog back and forth, and means for alternatelyraising and lowering the feed don and presser foot, said means including a rock lever, means for oscillating the rock lever, means for positively lifting the presser foot from said rook lever, a rod connected to the rock lever and to the feed dog, said rod having a lost motion connection with one of said parts, a spring interposed between the rock lever and the feed dog, constructed so as to collapse and become a rigid member whereby the feed dog and presser foot may remain for an interval of time upon the material before their lifting movement.

5. A feeding mechanism for sewing Inachines including in combination, a work support, a presser foot, an upper feed dog engaging the material on the work support, means for moving said upper feed dog back and forth, and means for alternately raising and lowering said feed dog and presser foot, said means including an arm rigidly connected to the presser bar, a rock lever fulcrumed on said arm, one arm of said rock lever being positioned substantially horizontally and parallel with the feed bar carrying the feed dog, a rod connected to said arm, a perforated lug carried by the feed bar through which said rod extends, an adjustable stop on the lower end of said rod, a coiled spring encircling said rod,-

and an abutment carried by the rod for said spring, said spring engaging the abutment on the rod and said perforated lug andbeing so constructed as to collapse and become a rigid member whereby the same may serve as an abutment for the lifting of the presser bar. a

6. A feeding mechanism for sewing machines including in combination, a work support, a presser foot, an upper feed dog engaging the material on'the work support, means for moving said upper feed dog back and forth, means for alternately raising and lowering the feed dog and presser foot, said means including an arm rigidly attached to the presser bar, a rock lever pivoted to said arm, one arm of said rock lever extending upwardly in a substantially vertical direction, a. rock frame, an arm desaid spring being v of said rod, an abutment carried by the rod,

a coiled spring encircling said rod and bearing against said abutment and said lug.

7. A feeding mechanism for sewing machines including in combination, a work 80 support, a presser foot, an upper feed dog engaging the material on the work support,

means for moving said upper feed dog back and forth, means for alternately raising and'lowering the feed dog and presser foot, said means including an arm rigidly at tached to the presser bar, a rock lever pivoted to said arm, one arm of said rock lever extending upwardly in a substantially vertical direction, a rock frame, an arm depending from said rock frame in a sub-- stantially vertical position, a link disposed substantially horizontally and connecting the arm on the rock frame to the arm of said rock lever, the second arm of said rock lever being disposed substantially horizontally, a rod pivoted thereto and extend ing downwardly through a perforated lug carried by the feed bar for the feed dog, an adjustable stop carried by the lower end of said ro d, an abutment carried by the rod, a coiledspring encircling said rod and bearing against said abutment and said lug, and means whereby the abutment and said rod may be adjusted for varying the tension of the coiled spring;

8, A feeding mechanism for sewing machines including in combination, a work support, a presser foot, an upper feed dog engaging the'.'material on the work sup- 110 port, means for moving said upper feed dog back and forth, means for alternately raising and lowering the feed dog and presser .foot, said means including an arm rigidly attached to the presser bar, a rock lever pivoted to said arm, one arm of said rock lever extending upwardly in a substantially vertical direction, a rock frame, an arm ing against said abutment and said lug, a serve as an abutment for the lifting of the spring for depressing the presserfoot, said resser foot. 1 spring being of greater tension than said in testimony whereof I allix my signature coiled spring, and said coiled spring being in the presence of two Witnesses.

so proportioned as to become of greater LANSING ONDERDONK. tension than the spring for the presser bar Vhtnesses: during the oscillating movements of the WALTER E. BARNES,

rock lever whereby said coiled spring may JOHN H. HOWELL. 

